Quote Originally Posted by Mike Lopez View Post
Does anybody here have any experiences or opinions of this lens worth sharing? I haven't found much on the Internet in the way of reviews and samples. I'd really like to read more opinions and see some sample output from this lens (particularly in black and white). Thanks in advance.
Spectacular wide angle effect. Moderate vignetting. Lens hood a must. Center sharpness is crisp at about f/8-f/11. Edges less crisp and contrast is so-so. It was too wide for me. I sold it. The 15mm Heliar is cheaper, sharper, smaller, and more contrasty. But if you need the ultimate RF wide angle lens, then you might like the 12. Also, the 12 requires that the camera not be tilted too much, otherwise straight lines become really badly bowed and distracting. I think the 12 is a special optic for very limited use. The photos that I shot of a 9-11 memorial construction obelisk were not acceptable to me.